wxgui: changed wxgui directory to be more 3.7-like (src/python -> python).
audio: wip: moving audio to 3.7 style. Headers renamed and moved.
audio: wip: conversion cont. Alsa building.
analog: wip: oss and jack converted and compiling.

C++ dial_tone example working.
analog: wip: name changes for alsa, oss, jack files.
audio: wip: fixing gr-fcd to build with new audio naming.
audio: wip: converting OSX audio to 3.7 style.
audio: wip: osx patches verified on an OSX machine.
audio: wip: converting windows audio to v3.7 style (untested).
Merge branch 'next' of gnuradio.org:gnuradio into next
audio: fixed Windows typos
channels: adding GRC tone example
channels: fix for phase imbalance/alias in the specular component for Rician channels, switch phase accumulator to double precision, exporting step size to grcp
core: adding variance calcs to perf. counters.

Using running mean/variance algorithm from Knuth's Art of Computer Programming.
Merge branch 'master' into next

Conflicts:
	gnuradio-core/src/lib/runtime/gr_block.cc
	gnuradio-core/src/lib/runtime/gr_block.h
	gnuradio-core/src/lib/runtime/gr_block_detail.h
core: adding variance perf. counters to ctrlport.
core: adding new var perf. counters to swig interface.
core: Making an all C++ version of the preferences/config file readers.

This replaces the Python config parser stuff; should have same functionality that we need.
core: adding and using a PerfCounters section to the config files.

gr_block_executor will read the config files to determine if the perf counters are on or off.
core: only query preferences database once at start of block_executor.